Why does it rain more at weekends?

Because during the week the level of pollution is higher due to people working , moving around in cars, factories etc all giving off warmth. This builds up in the atmosphere around the earth.
When on Friday evening eveyone packs up and goes home the level of pollution suddenly drops and the air goes cold causing all the water (in the form of condensation) to fall pulled by gravity to the earth as rain. And it's particularly annoying if you are planning on going on holiday or want to do some washing.

I don't know if this is true or not but then this whole blogg is pretty difficult to believe.